Hologic Inc. is a leading supplier of high quality, innovative and clinically valuable diagnostic systems and tests. The company develops, manufactures and markets X-ray bone densitometers and ultrasound bone analyzers that address a growing market for osteoporosis prevention and treatment -- a key element of women's health care. The systems are used by more leading medical schools, universities and osteoporosis opinion leaders than any other bone densitometer.

Companies in this category produce a huge variety of different products. Most are related to the medical field, but as diverse as that field is, so are the products these firms produce. While some products are used solely for the aesthetic and therapeutic care of the patient, others are used for more urgent or life-saving practices. Several companies on this list are developing more accurate and efficient MRI scanners and one is even hoping to offer an alternative to the uncomfortable traditional mammography women typically have to endure. On the life-saving side of this group, many companies have products that help those with potentially lethal arrhythmias to control them and lead a normal life. Several others have products either on the market or in the works that will help those with other problems such as bladder control, neurological damage, and prostate disorders.